You are able now to delete emails “officially” from Gmail, just to welcome Gmail to the webmails world while it try to be something new and different from others. The delete button was possible to add for firefox users thanks to Greasmonkey script
When you’re positive you won’t need a message, use the Delete button to send it to Trash. Deleted messages and conversations are permanently removed from your Gmail account 30 days after you send them to Trash. Deleting unimportant mail is a great way to free up some of your storage, but with more than two gigabytes, you could even keep those messages, too! So, if it’s possible that you’ll need a message or conversation in the future, we recommend using the Archive feature.
